tail wheel...
A BN-2A-20 fitted with floats. Twin floats were attached to the undercarriage legs and incorporated retractable landing gear.
To see the...'amphibious BN-A'... goto cthornberg's post #3 at:
Float Equipped BN Islander? - Key Publishing Ltd Aviation Forums
I flew Islanders in PNG in the 70's with Macair in PNG. All I can say after looking at the picture referred to above is...thank Christ Macair didn't have this variant!